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Olga Natkovich commented on PIG-2185: ------------------------------------- Also which version of Pig is causing this behavior? > NullPointerException while Accessing Empty Bag in FOREACH { FILTER } > -------------------------------------------------------------------- > > Key: PIG-2185 > URL: https://issues.apache.org/jira/browse/PIG-2185 > Project: Pig > Issue Type: Bug > Reporter: Mitesh Singh Jat > > On doing FILTERing on empty bag inside FOREACH, NullPointerException occurs. > The following pig script demonstrates the issue: > {code:title=empty_bag.pig} > A = LOAD 'input/empty_bag.in' USING PigStorage() AS (bg:bag{}, ch:chararray); > B = FOREACH A { > x = FILTER bg BY $0 == '12'; > GENERATE > *, > x; > }; > DUMP B; > {code} > Input is: > {code:title=input/empty_bag.in} > {(12)} a > {(23)} b > c > {code} > Upon execution of Pig Script empty_bag.pig, the NullPointerException comes as > shown below: > {code} > $ pig -x local empty_bag.pig > ... > 2011-07-11 09:52:56,810 [Thread-3] WARN > org.apache.hadoop.mapred.LocalJobRunner - job_local_0001 > java.lang.NullPointerException > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.getNext(POProject.java:448) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.processInput(PhysicalOperator.java:290) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter.getNext(POFilter.java:95) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:406) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject.processInputBag(POProject.java:570) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.PORelationToExprProject.getNext(PORelationToExprProject.java:107) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.processInput(POUserFunc.java:159) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:184) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POUserFunc.getNext(POUserFunc.java:258) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator.getNext(PhysicalOperator.java:316) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.processPlan(POForEach.java:332) > at > org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POForEach.getNext(POForEach.java:284) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:261) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:256) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:58) > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370) > at > org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:210) > ... > {code} -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira